Patrick henry griffin



UNITED STATES PATRICK HENRY GRIFFIN,

PATENT OFFICE.

OF BUFFALO, NEW YORK.

GAGE.

SPECIFICATION forming part of Letters Patent No. 413,779, dated October 29, 1889.

* Application filed June 14, 1889i Serial No; 314,288. (No model.)

To all 1071,0771, it may concern:

Be it known that I, PATRICK HENRY GRIF= FIN, of Buffalo, in the county of Erie and State of New York, have invented certain new and useful Improvements in Measuring Gages; and I do hereby declare that the following description of my said invention, taken in connection with the accompanying sheet of drawings, forms a full, clear, and exact.

. then pointed out in the claims.

3o ters of pulleys, cylinders, car-wheels, chills for car-wheels, and-in factiall work of a similar nature.

To attain this result,l construct my device of a main bar A, having at one end two prongs K K projecting outwardly from the same in the shape of the letter Y, said prongs being stiffened by rods L L, the ends of which are fastened. to the said prongs K K. Near the outer ends of these prongs are located two downwardly-p roj ectinglegs a a and overhanging bars R B, said legs being set at an angle, the point of which is at the junction of the prongs and main bar A. At the other end of the main bar -is located a sliding bar B, having two slots E E, within which the bolts e e are fitted, said bolts being screwed into the bar A, with their heads overlapping the slots, thus allowing the said bar B to be moved back and forth, said slots having a length equal to the capacity of the device,

plus double the width of the downward projection a, as hereinafter described. Upon one end of said bar B is located a downwardly projecting leg I) and overhanging bar '1", while upon the other end is located a pivotbolt f, upon which is journaled a connecting rod H, having three holes or eyes i 11 2', respectively, the eye t' being the one by which said rod is journaled upon a pivoting-bolt h in the lever G. This rod H is held in position upon the bolt h by the nut 71/, said nut having flat spaces thereon for the application of a wrench to unscrew the same when necessary.

Upon the center of the bar A is located a semicircular dial 0, having graduations 0, adapted to indicate the inside diameter of the object which the device is arranged to measure. Upon the reverse side of said dial are shown further graduations d to enable one to ascertain the outside diameter at which the device was last set when used as an outside caliper. Y

G is a lever, pivoted with its lower end on the bar A at the center of the dial 0 by a shoulder-bolt M, as clearly shown in Fig. 4. A short distance above the lower end of said lever is located the pivoting-bolt h, already mentioned. Near the upper end of said lever G is provided an aperture 9, by means of which the figures of the graduation 011 the dial may be seen. In the upper end of this aperture is placed a pointer o, to indicate inside diameters when used as a gage for gaging the inside diameters of cylinders, rings, chills, &c. On the back of the said lever G is secured by rivets N a guard-piece J, to keep said lever in connection with the semicircular dial 0, said guard-piece having an excision shaped so as to form therein a pointer j, as clearly shown in Figs. 3 and 4, the former, in conjnnctionwith suitable graduations d, indicating the outside diameters to which the apparatus may be set. v

In operation the device is used as follows: When the device is to be used for measuring inside diameters such as the inside of rings, cylinders, chills for the treads of car-wheels, &c.=the connecting-rod H engages the sliding bar B at the inner eye 1'. The legs a, a,

and b of the device are then placed on the interior of the Work to be measured, with the overhanging bars a" R R bearing on the face of said work. The lever G is then manipnlated until the legs touch the work. The device is then removed, when pointer 0 will indicate upon the dial the correct diameter of the work, it being understood that these gages are to be used for ascertaining the variations from the diameters of standard worksuch as car-wheels, pulleys, &c.where the predetermined sizes are known. For instance, supposing a thirty-tln'ee-inch carwheel is to be measured on a thirty-three-inch caliper, the pendent bars a a b are so arranged that when the respective pointer stands in the center of the semicircular dial the gage will measure exactly thirty-three inches, so that any variation from this size, either larger or smaller, will be indicated on the respective side of said dial. When the device is to be used for outside work of the same diameter, the nut f is unscrewed and the connecting-rod removed from the pivotbolt f, when the sliding bar 11 is moved outwardly until the pivot f is opposite the outer eye 1' in the connecting-rod, when the said eye is placed upon the pivot bolt and the nut replaced. The device as now set will indicate exactly the same outside diameter as it heretofore showed the inside, so that if work were fitted to the size indicated by the device it would be a correct fit.

It will be seen that the range of the device is governed by the distance between the bolt upon which the lever G is journaled and the bolt upon which the connecting-rod is placed. It may in some cases be advantageous to increase the range of the device by increasing the distance between the two bolts M 7L, or the conneeting-rod may be provided with a larger number of eyes to increase the range of work capable of being measured, such changes being in no wise a departure from the nature of my invention. It will be further observed that this device is especially adapted for use in the measurement of car-wheels and their chills.

Car-wheels are usually designated by numbers. \Vhen the treads of the same are trued up, they are gaged to ascertain the diameter in inches, from which the corresponding numher is ascertained. In such cases it will be advantageous to inscribe the numbers of the .wheels upon the dial instead of the diameter in inches, thus obviating the necessity of ascertaining the number of the car-wheel from the diameter in inches, such graduation being an equivalent of the present graduation, and will be within the scope of my invention. The hereinbefore-described device may be produced in wrought-iron in the process of forging, while the connecting-rod may be produced in malleable iron, so that when the device is finished in a substantial manner it will be a serviceable implement for use in machine-shops, car-wheel factories, locomotiveqvorks, pattern-shops, &c., especially so since it can be produced at a low figure.

In some cases it maybe advantageous to dispense with one of the pointers, so as to use it as an outside or an inside caliper only-a matter which will suggest itself to the intelligent mechanic.

Having thus fully described my invention, I claim as new and desire to secure to me by Letters Patent of the United States- 1. A gage for measuring the treads of carwheels and similar objects, consisting of a stationary bar having two legs and a suitable dial, a further bar provided with a single downwardly-projecting leg, and a lever fulcrumed on the stationary bar and connected with the movable bar by a connecting-rod, said bars being held in sliding contact by screw-bolts passing through apertures in the movable bar, as and for the purpose set forth.

2. In measuring-gages, the combination, with the bar A, having legs a a, of a movable bar B, having two longitudinal slots E E, engaging bolts 6 e, and near its end a leg I), lever G, fulcrumed on the bar A and connected with the bar B by the connecting-rod II, and a suitable dial upon said bar A, as and for the purpose set forth.

3. In measuring-gages, a dial having graduations on both of its faces, in combination with a lever having its fulcrum in the center of said dial, said lever having in its face an opening provided with a pointer and on the back a guard-piece overlapping the edge of said dial, and also provided with a pointer, whereby the graduations on either side of said dial may be used and the lever held in proper position, substantially as described.

4. In measuring gages, the combination, with the bar A, having two downwardly-projecting legs at a and overhanging bars R R, a dial 0, having graduations c d, a sliding bar B, having longitudinal slots E E, bolts 6 e, a downwardly-projecting leg I), and overhanging bar 7, a pivoted lever G, having aperture 9, provided with a pointer 0 on one side and a guard provided with a pointer j on its opposite side, and a connecting-rod II, to 0011- nect the stationary bar with the movable bar, all as set forth.

5. In a combined in and outside measuringgage, the combination, with the bar A, having near one end a Y-shaped fork provided with downwardly-projeeting legs a, a and overhanging portions R R, and on the other end a sliding bar B, provided with two longitudinal slots E E and downwardly-projecting leg I), and two screw-bolts e e, engaging in said slots and being screwed into said bar A, whereby the said bar B is movably secured to the said bar A, substantially as and for the purpose stated.

In testimony that I claim the foregoing as my invention I have hereto set my hand in the presence of two subscribing witnesses.

PATRICK HENRY GRIFFIN.

Attest:

WM. 0. STARK, MICHAEL .T. STARK.

IIS 

